I have just reconditioned a genuine Dunlop compressor. It is working well although getting hot if I push off road and access several times which I expect.

The gallery pressure has dropped from 52.5 to 29.9 psi in four hours while the car is standing. I want to know if this is normal or maybe I have a leak? I have never noticed it down on its stops or down on front or rear even when left for 3 weeks.